Means for stringing tennis rackets



Dec. 5, 1933. 5 TAUBER ET AL 1,938,562

MEANS FOR STRINGING TENNIS RACKETS Original Filed March 22, 1929 qg l Tau b r INVENTORS vim ATTORNEY tit Patented Dec. 5, 1933 MEANS FOR STRINGING TENNIS RACKETS Siegfrid Tauber and Ladislaus Ih'schmann,

Vienna, Austria, assignors, by mesne assignments, to Dunlop Rubber Company Limited,

London, England Original application March 22, 1929, Serial No. 348,328, and in Austria. October 17, 1928. Divided and this application July 9, 1931.

Serial No. 549,671

2 Claims.

This invention relates to improvements in means for stringing of tennis rackets with strings and the present application is a divisional application of applicants copending application filed March 22, 1929, Serial No. 348,328.

A constructional example of the means employed is shown in the annexed drawing in which Fig. l is a vertical section on the line II of Fig. 2 and Fig. 2 shows the means in plan.

On the frame not shown of a device described in the application S. No. 348,328 are mounted two bars 1 and 2 in the longitudinal direction of the racket. To the undersides of the bars 1 and 2 are riveted two cross bars 3 and 4, to each of the ends of which two-armed levers 5, 6 and 7, 8 are respectively pivotally attached. On the end of the lever arm 6 (8) are pivotally mounted two tong-like levers 9, 10. The ends of these levers are formed into clamping jaws 12, 13 and covered with rubber for the protection of the frame of the racket. Between the other ends of the levers 9, 10 is arranged an eccentric 14 which can be rotated by means of the lever 15. To each of the lever arms 5, '7 is pivoted a connecting rod 20, 21 and these rods are pivotally connected to a two-armed lever 22 mounted to rock beneath the bar 3. This, ensures that the two levers 5, 6 and '7, 8 can only move in unison and each to the same extent. The lever 22 has at one end an extension 23, which carries a screw-threaded bolt 24. his bolt is guided in a slot 25 in a plate 26 mounted beneath the bar 3 and can be secured in any. position in said slot by means of a wing nut. As shown in Fig. 2, there are provided on each side of the apparatus two such clamping devices for the side portions of the frame 28, and the clamping jaws 12, i3 engage on both sides of the weakest portions of the frame 28. The clamping jaws 12-13 lie in a common horizontal plane which is the working plane. Advantageously there are in addition to the clamping jaws for the frame 28 of the racket also clamping jaws for the handle 30 of the racket as described in the application S. No. 348,328.

The frame of the racket is laid in the clamping device and by working the handle 15 the side portions of the frame 28 of the racket will be firmly clamped by the clamping jaws 12, 13.

By the connection of the clamping devices 12, 13 through the connecting rods 20, 21 and the lever 22 any possibility of unsymmetrical distortion of the frame is obviated. In order to prevent any bending of the side portions of the frame when tightening up the longitudinal strings, the locking device 24 is provided in the slot 25 in the plate 26.

What we claim is:

1. A clamping device for a tennis racket, co prising two pairs of oppositely disposed clamping members arranged to clamp to the racket frame adjacent to and on opposite sides of a line drawn through the minor axis of the frame, pivotally mounted supporting pieces carrying each pairof clamping members, and connecting means for the supporting pieces carrying each pair, whereby movement of one clamping member thereof will impart a corresponding movement to the other member.

2. A clamping device for atennis racket, comprising two pairs of oppositely disposed clamps arranged to engage the racket frame adjacent to and on opposite sides of a line drawn through the minor-axis of the racket, a U-shaped frame having its upright arms pivotally supported and being disposed to carry a pair of clamps on the upper free ends of the arms, and connecting means for the lower ends of the arms of the U-irame comprising inwardly directed links from the arms, a lever pivotally mounted at its midportion and connected to the inner ends of the links at its ends, and a segmental plate to receive the lever and hold it fixed in any of its adjusted positions.

SIEGFRID TAUBER. LADISLAUS FISCHMANN. 

